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第12届上海市高中基础物理知识竞赛有如下几题,颇具特色:第18题:图1是用高速摄影机拍摄到的子弹射过扑克牌的一幅照片.已知子弹的平均速度约为900m/s,子弹的真实长度为2.0cm.试估计子弹穿过扑克牌的时间t约为.图1图2第19题:计算机上常用的“3.5英寸、144MB”软磁盘的磁道和扇区
The 12th Shanghai High School Basic Physics Knowledge Contest has the following questions, which are quite distinctive: Item 18: Figure 1 is a shot of a shot shot with a bullet taken by a high-speed camera. The average speed of the known bullet is about 900m. /s, The real length of the bullet is 2.0cm. Try to estimate the time t when the bullet passes through the playing card. Figure 1 Figure 2 Problem 19: Tracks and sectors of a “3.5-inch, 144MB” floppy disk commonly used on computers